Carbureter



W. L. MARR.

CARBURETER.

APPLICATION FILED JAN-17,1917- 1,361,529. Patented Dec. 7, 1929.,

UNITED STATES WALTER L. MARE, OF SIGNAL MOUNTAIN, TENNESSEE.

CARBURETER.

Specification of Letters Patent.

Patented Dec. '7, 1920.

Application filed January 17, 1917. Serial No. 142,827.

To all whom it may concern:

Be it known that I, WALTER L. MARR, a c tizen of the United States of America, resldmg at Signal Mountain, in the county of Hamilton and State of Tennessee, have invented certain new and useful Improvements in carbureters, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to carbureters and has special reference to that type of carburetors having a float chamber, a constantly open air intake connection, and a mixing chamber that is automatically placed in communication with the air intake connection.

The primary object of my invention is to provide a carbureter of the above type wherein the float chamber, air intake connection and mixing chamber are in superposed relation with a novel valve between the air intake connection and the mixing chamber so that the valve may automatically control the inlet and distribution of air and fuel to the mixing chamber. The valve is constructed to emit air and fuel from its edges into the mixing chamber before leaving its seat and eventually establish direct com munication with the air intake connection. The valve may also be made in two parts adapted to have the parts thereof successively actuated by a reduction of atmospheric pressure in the mixing chamber, and provision is made so that the first part of the valve to be automatically actuated will allow a suflicient quantity of air and fuel to enter the mixing chamber. The other part of the valve is arranged to be automatically moved so that a full supply of air will be admitted to the mixing chamber to commingle with the fuel admittedto said chamber, and associated with the valve is an adjustable fuel nozzle or jet that may be easily and quickly regulated relative to a pin carried by a part of the valve, in order that a correct and desired proportion of fuel may be admitted to the mixing chamber in proportion to the amount of air entering the same.

Another object of my invention is to provide a carburetor of the above type wherein the parts are constructed with a view of reducing the cost of manufacture and at the same time retainthe features by which durability, ease of assembling, and ready control are secured, and with such ends in view, my invention resides in the novel construction, combination and arrangement of parts to be hereinafter specifically described and then claimed.

Reference will now be had to the draw- 111g, wherein- Figure 1 is a vertical sectional view of a carbureter; and

Fig. 2 is a horizontal sectional view taken on the line II--II of Fig. 1.

In the drawing, 1 denotes a float chamher, 2 an air intake connection, and 3 a mixing chamber, these parts being in superposed relation with the air intake connection 2 seated on top of the float chamber 1 and the mixing chamber 3 seated on top of the air intake connection.

The float chamber 1 is of conventional form having a fuel supplying connection 4 and a float 5 maintaining a predetermined level of gasolene or other fuel within the chamber 1.

The air intake connection 2 has an-open end 6 constantly open to the atmosphere and said air intake connection has the bottom thereof provided with an air chamber 7 and a depending support 8 which is concentric of the float chamber 1 and centrally of the float therein. Communication between the air intake connection 6 and the chamber 7 is established by a plurality of ports 9 and adjustable in the support 8 of the air chamber 7 is a fuel nozzle or jet 10. The nozzle 10 has a longitudinal bore 11 communicating with the float chamber 1 through the medium of a port 12, and the lower end of the nozzle 10 is adjustable in the bottom of the float chamber 1, as at 13, and by rotating the nozzle 10, it may be raised or lowered in the support 8, but at no time is the port 12 raised above the supply of fuel within the float chamber.

The air intake connection has a stand pipe 14- in the vertical axis of the support 8, in communication with the chamber 7 and into which the upper flared end of the nozzle or jet 10 extends. The top of the air intake connection 2 has an air exhaust opening 15 providing a valve seat 16 and the upper end of the standpipe 14 extends to the opening 15 and concentric therewith. j

The standpipe 1% acts as a tubular guide on which is slidable a sleeve 17 which has the upper end thereof integral with a convex valve head 18 adapted to engage a portion of the valve seat 16. Adjacent the lower flat face of the valve head 18 is an annular shoulder 19 and loose upon the sleeve 17, against the shoulder 19, is a valve member 20 engaging the remaining portion of the valve seat 16 and cooperating with the valve head 18 in providing a closure for the opening 15. The valve member 20 has the upper face thereof confronting the lower flat face of the head 18 dished or cupped to provide a chamber 21, said chamber communicating with the upper end of the sleeve 17 through the medium of a plurality of radially'disposed ports 22. The valve member 20 may be soldered or otherwise fixed on the sleeve 17 in spaced relation to the valve head 18 so as to provide a peripheral outlet, and when so arranged the valve head 18 and valve member 20 move as a single unit or valve.

Mounted concentrically with the valve head 18 is an adjustable pin 23 extending into the standpipe 14:, said pin having a lower tapering or reduced end 241- in the bore 11 of the nozzle or jet 10, and intermediate the body of the pin 23 and the end 24 thereof is a tapering shoulder or valve portion 25 that may seat in the upper flared end of the nozzle or jet 10.

The mixing chamber 3 is of suhicient area to provide clearance for the valve head 18 and the valve member 20, when raised, and said mixing chamber is adapted to be connected to an intake manifold of an internal combustion engine in the usual and well known manner. A conventional form of throttle valve 26 is located in the upper portion of the mixing chamber 3 and controls the supply of fuel to an engine.

The air intake connection 2 is constantly in communication with the atmosphere and with the chamber 7 and with the standpipe 14, and when the throttle valve 26 is adjust'ed to place the mixing chamber 3 in communication with the intake manifold and the cylinders of an internal combustion engine, a reduction of atmospheric pressure mospheric reduction above the valve head valve' member. As the pin 23 is carried by the valve head-'18, said pin will be raised to a certainextent and establish communication between the stand pipe ll and the nozzle or jet 10 which is supplied with fuel from the float chamber 1. Since the stand pipe 11 communicates with the chamber 7 and said chamber with the air intake connection 2, air will be drawn into the standpipe 14 to commingle with fuel therein and as air and fuel are drawn through the ports 22 into the chamber 3, there is a thorough commingling of combustible particles of fuel and air. As the engine picks up speed. and atmospheric reduction is increased in the chamber 8, the valve member 20 is eventually uns'eated, thus allowing air to pass through the opening 15 into the mixing chamber. The shape of the valve member 20 is such that it deflects air toward the walls of the chamber, and as the previously mixed fuel and air must pass out from under the peripheral edges of the valve head 18, the air passing into the mixing chamber is fully saturated with vaporized gasolene or other fuel, and as long as the engine continues to operate the valve head 18 and the valve member 20 remain raised, as indicated by dotted lines in Fig. 1.

The supply of fuel to the standpipe 14; can be minutely regulated by adjusting the nozzle or stem 10 in the support 8 relative to the pin 28, and as the pin is free to move relative to the nozzle or stem 10, said pin will automatically control the outlet of fuel. lVith the valve head 18 free to raise and lower in the mixing chamber 3, the outlet of fuel will be in proper proportion according to the speed of the engine, and the floating valve member 20 will properly proportion the amount of air entering the mixing chamber.

I attach considerable importance to the two floating valve parts and the adjustable nozzle or jet, as these elements will insure a. proper mixture of fuel and air during any engine speed.

It is thought that the operation and utility of the invention will be apparent without further description, and while in the drawing there is illustrated a preferred embodiment of my invention, it is to be understood that the structural elements are susceptible to such variations and modifications as fall within the scope of the ap 'iended claims.

What I claim is 1. In a carbureter having an air intake, a mixing chamber and a fuel nozzle, a tubular guide surrounding said fuel nozzle, a valve having a sleeve sliding on said guide and having an enlarged head controlling the entrance to said mixing chamber and carrying a member controlling the discharge of fuel from said nozzle, and a second valve slidina. on the outside of said sleeve and also controlling the entrance to said mixing chamber.

2. In a carbureter having an air intake. a mixing chamber, and a fuel nozzle, a tubular guide surrounding said fuel nozzle, means for supplying air to the interior of the tubular guide, a valve having a sleeve sliding on said guide and having an enlarged head which controls the connection between the tubular guide and the mixing chamber and Which carries a means controlling the discharge of fuel from said nozzle and a second valve sliding on the outside of said sleeve and controlling the entrance to said mixing chamber.

In testimony whereof I affix my signature in the presence of two Witnesses.

WALTER L. MARE. Witnesses:

TH. WARNER, ALIoE SEERHEND. 

